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          异步式编程
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        <p>多线程是如今程序员所必须掌握的一门“手艺”，随着CPU核数越来越多，只有能充分发挥CPU的性能才能体现一个手艺人的价值。不过好在，随着时代的变化，语言本身也在发展。无论是GO语言的出现还是说框架开始支持多线程的配置，都是为了更好的支持异步式编程。那么，今天来看下Java对于异步式编程的支持吧。</p>
<a id="more"></a>

<h2 id="JDK提供的异步式编程API"><a href="#JDK提供的异步式编程API" class="headerlink" title="JDK提供的异步式编程API"></a>JDK提供的异步式编程API</h2><p>CompletableFuture是JDK 8提供的API接口，以往的多线程往往是把任务往线程池一扔就完事了。而CompletableFuture的出现，则更好的符合了程序员对于异步式编程的需要。包括了返回结果之后的操作还有产生错误异常的操作。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">CompletableFuture&lt;String&gt; completableFuture = CompletableFuture.supplyAsync(() -&gt; &#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="string">&quot;success&quot;</span>;</span><br><span class="line">&#125;);</span><br><span class="line"></span><br><span class="line">completableFuture.thenApply(s -&gt; &#123;</span><br><span class="line">    System.out.println(s);</span><br><span class="line">    <span class="keyword">return</span> s;</span><br><span class="line">&#125;).whenComplete((result, throwable) -&gt; &#123;</span><br><span class="line">    <span class="keyword">if</span> (throwable != <span class="keyword">null</span>) &#123;</span><br><span class="line">        System.out.println(throwable.toString());</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        System.out.println(result);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;);</span><br></pre></td></tr></table></figure>
<h2 id="ForkJoinPool的使用"><a href="#ForkJoinPool的使用" class="headerlink" title="ForkJoinPool的使用"></a>ForkJoinPool的使用</h2><p>看到CompletableFuture就不得不提ForkJoinPool，因为CompletableFuture的实质就是通过ForkJoinPool来实现的。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">private</span> ForkJoinPool pool = <span class="keyword">new</span> ForkJoinPool();</span><br><span class="line"><span class="keyword">private</span> <span class="class"><span class="keyword">class</span> <span class="title">SumTask</span> <span class="keyword">extends</span> <span class="title">RecursiveTask</span>&lt;<span class="title">Long</span>&gt; </span>&#123;</span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">long</span>[] numbers;</span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">int</span> from;</span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">int</span> to;</span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">protected</span> Long <span class="title">compute</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        <span class="keyword">if</span> (to - from &lt; <span class="number">6</span>) &#123;</span><br><span class="line">            <span class="keyword">long</span> total = <span class="number">0</span>;</span><br><span class="line">            <span class="keyword">for</span> (<span class="keyword">int</span> i = from; i &lt;= to; i++) &#123;</span><br><span class="line">                total += numbers[i];</span><br><span class="line">            &#125;</span><br><span class="line">            <span class="keyword">return</span> total;</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            <span class="keyword">int</span> middle = (from + to) / <span class="number">2</span>;</span><br><span class="line">            SumTask taskLeft = <span class="keyword">new</span> SumTask(numbers, from, middle);</span><br><span class="line">            SumTask taskRight = <span class="keyword">new</span> SumTask(numbers, middle+ <span class="number">1</span>, to);</span><br><span class="line">            taskLeft.fork();</span><br><span class="line">            taskRight.fork();</span><br><span class="line">            <span class="keyword">return</span> taskLeft.join() + taskRight.join();</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="title">SumTask</span><span class="params">(<span class="keyword">long</span>[] numbers, <span class="keyword">int</span> from, <span class="keyword">int</span> to)</span> </span>&#123;</span><br><span class="line">        <span class="keyword">this</span>.numbers = numbers;</span><br><span class="line">        <span class="keyword">this</span>.from = from;</span><br><span class="line">        <span class="keyword">this</span>.to = to;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<p>ForkJoinPool内部结构：<br><img src="https://olwr1lamu.qnssl.com/forkjoinpool.png" width="100%" height="100%" alt="ForkJoinPool"/></p>
<h2 id="RxJava"><a href="#RxJava" class="headerlink" title="RxJava"></a>RxJava</h2><p>当然除了JDK提供支持，还有更多的框架加入了异步式编程的支持。典型的就有Srping5，使用Mono和Flux能够帮助使用者用一种更好的方式来搭建一个服务。由于响应式编程的特性，Spring WebFlux和Reactor底层需要支持异步的运行环境，比如Netty和Undertow；也可以运行在支持异步I/O的Servlet 3.1的容器之上，比如Tomcat（8.0.23及以上）和Jetty（9.0.4及以上）。</p>
<p>而RxJava则是这一理念的翘楚，因为不仅提出了异步式编程，还提出了背压的概念。啥叫背压呢？其实就是当你编写异步编程的时候，上游产生速度远远大于下游消费速度。RxJava提供了一个背压的概念，能够堆积上游的业务，保证还是接受到了这些业务，而不是简简单单的拒绝。不过这些是RxJava里面的概念，我们今天仅仅是来看看RxJava是如何来实现一个异步式编程的。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line">Observable observable = Observable.create(<span class="keyword">new</span> ObservableOnSubscribe&lt;Object&gt;() &#123;</span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">subscribe</span><span class="params">(ObservableEmitter&lt;Object&gt; observableEmitter)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">        observableEmitter.onNext(<span class="string">&quot;hello world&quot;</span>);</span><br><span class="line">        observableEmitter.onComplete();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;);</span><br><span class="line"></span><br><span class="line">Observer observer = <span class="keyword">new</span> Observer&lt;String&gt;() &#123;</span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onSubscribe</span><span class="params">(Disposable disposable)</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">&quot;onSubscribe&quot;</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onNext</span><span class="params">(String s)</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">&quot;onNext:&quot;</span> + s);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onError</span><span class="params">(Throwable throwable)</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">&quot;onError&quot;</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">onComplete</span><span class="params">()</span> </span>&#123;</span><br><span class="line">        System.out.println(<span class="string">&quot;onComplete&quot;</span>);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line">observable.subscribe(observer);</span><br></pre></td></tr></table></figure>
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